Malicious PDF — malware analysis report

Static analysis result for SHA-256 497766ee355d53e3…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 06:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db15dad45918fa4b9b55f7ba9e4463a8 SHA-1: 19328c7986b4cb454c52a7a8b86148a281650ad8 SHA-256: 497766ee355d53e3297b9e369b205247fcbaddff7bd0e6f5ef073ae199f15311
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://travelci.ru/ckfinder/userfiles/files/5167169196.pdf In PDF document text
    • https://efckrakow.pl/userfiles/file/88352982249.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/96644603323.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/pixom.pdfIn PDF document text
    • http://c-six.it/userfiles/files/90429347762.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/82818888750.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63836676697.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/5622380936.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/15081397567.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/wonowifoli.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/68301885169.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/fivakagix.pdfIn PDF document text
    • http://zeci.nl/im/image/bitobizev.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1bf69ceb9---vijurejipanavobojizijapif.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/77238990256.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613623dc860ea---giwonuwelegirolar.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/22836203220.pdfIn PDF document text
    • https://dacola.com/upload/files/mudifuzuzofageta.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/70918238092.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385c99631ed---84585456228.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/zekaw.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/29615716132.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/47613791925.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/71326308404.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/43787104726.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/85544168673.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/rigakoxatixesalefirudak.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/jiwijejigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pixel+4+xl+live+wallpaperPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 10088 bytes
SHA-256: 6393b3121f4a7a3181f03e5f8ee97e7d3124790cd5b541230353ce795a6f1749
font_01_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 19020 bytes
SHA-256: e3c0547b82fe99dd8efbb02ccf9495deea73d415173835cca0aa647a0db2765e
font_02_sfnt_off000125de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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